Percussive tool



Feb. 26, 1929.

E. G. GARTIN PERCUSSIVE TOOL Filed Jan. 9 1920 Mali Patented Feb. 26, 1929.

UNITED STATES PATENT OFFICE.

ELMER G. GARTIN, F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

PERCUSSIVE TOOL.

Application filed January 9, 1920. Serial no. 350,450.

My invention relates to percussive tools.

In certain well known types of percussive tools, the control for the cleansing water has consisted of a manual valve located in a hose leading from a suitable source of supply. it-h this construction, the operator has had at least'two valves to manipulate. A later development employs a throttle valve controlling both the supply of air to the motor, the supply of cleansing air, and the supply of cleansing liquid. This latter development results in a rather complicated type of throttle valve in which air and water passages are located in close relationship. A further disadvantage is that in some mines the head of the cleansing water, due to the great elevation of the source, exceeds the air pressure and accordingly flooding of the machine is possible through leakage of water into the air passages. In cold weather this results attimes in the freezing of the parts together and in great difliculty in the manipulation of the valves.

' The object of my invention is to provide an improved form of motive and cleansing fluid control device for such tools, and more.

especially, one in which leakage between the liquid and gaseous media is reduced to a min imum. A further object of my invention is to provide an improved mechanism of this type in which the control valve for the mo tor shall be subjected to leakage of cleansing liquid to a minimum degree, whereby freezing of the parts may be prevented in cold weather. A further object of my invention is to provide an improved type of control for liquid and gaseous cleansing fluids, wherebyllmugh separate control valves are employed, the same are operated by a single control member-and the operative relationship of these valves, found desirable in practice, is maintained.

In the accompanying drawings I have shown, for purposes of illustration, one embodiment which my invention may assume in practice.

In these drawings,

I ig.1is a rear end elevation of a percussive motor provided with a control mechanism embodying the illustrative form of my improved mechanism, parts being broken away to clearly illustratetlie construction.

Fig. 2 is a partial section on the line 22 of Fig. 1. V

Fig. 3 is a partial section on the line 3-3 of Fig. 1 through the rear end of a percussive motor embodymg the illustrative form of my improved construction.

. Fig. 4.- is an elevation of one of the control elements with parts broken away.

Figs. 5 and 6 are diagrammatic views showing transverse sections a, b, and 0 taken, respectively, on the planes of lines a-a, 6-7), and cc of Fig. 4 and disclosing the relative positions of the several parts.

In these drawings, 1 represents apercussive motor of well known form comprising a. cylinder 2, within which reciprocates a piston 3, the rear end of the cylinder being closed by a head 4 provided with a throttle valve 5 controlling the supply of fluid to the motor, and also with an oil reservoir 6. Extending forwardly from the head andpassing through the piston is a cleansing fluid tube 10 secured in a suitable gland 11 in the rear head 4 of the cylinder-and provided with a supplypassage 12 through which air or water may be conducted to the steel as later indicated. The general construction ofthese parts is well known, and no claim is made to them per se as a part of my invention.

In the illustrative embodiment of my inv vention the throttle valve, indicated generally by 5, comprises a casing 15 of truncated conical form having attached to the bottom thereof a suitable closure member 16 connected with a fluid pressure supply line 17. Viithin the casing is mounted a valve member also of truncated conical form and lesig-' nated 1S herein. The valve member 18 is bored preteral'ily about two-thirds of its length and reamed to form an internal cham her 19, preferably conical in form. Formed in the walls of this chamber are two passages 21 and 22. Passage 21 is located relatively near the base of the'conical valve member 18 and is of relatively large size constituting the bounding wall of chamber 19 relatively near its smaller end and is located approximately in the same plane as the edge of passage 21 furthest removed from the port 23 when the throttle valve is in closed position as shown in Fig. 2. Cooperating with the port 22 is a port 24 (Figs. 2 and 3) leading to a passage 25 which communicates with the cleansing fluid tube 10. An inspection of Fig. 5 will showthat as the valve 18 is rotated in the ditosupply air from the hollow interior 19 of i I ii Hi. -,e... the valve tothe .cleansing tluid tubelO and that further ;otation or" the control valve has closed the supply of air to the tube and 7 one side, as best shown in Fig. 1, to form a .has opened communication between the por 21 and passage23 permitting" thereby the supply of air to the motor; The smaller end of the c'o'nic'al valve member l8 is cut away on cam surface 30, the location of the'ca n i'being such that'atthe moment when communication between passage and port 22 is closed,

'water may be supplied through suitable valve mechanismfil, hereinafter described, to the cleansing fluid tube, this supply of water conti'nuingdue tothe shape oi? the cam, throughout-the operation of the tool. To

accomplish the supply of water to the cleansing tube 10, I have arranged for cooperation with the cam 30, a valve generally indicated as 32, this valve being of the conical seat type and having formed thereon a conical surface 38 to cooperate with a conical seat 34.

The valve below its seat is reduced for a portion of its length, as shown at 35, to tormja chamber adapted to inter-connect the annular water supply passage 86 surrounding the valve below its seat with a similar a'nnular passage 37 formed above the valve seat and communicating with the port 25 previously described. The valve 31 is provided with a stem 38 which normally does not engage, but which may be engagedand raised by the cam surface 30" on movement of the latter relative thereto. A spring pressed packing 40 surrounds the stem at its lower end "and is adapted-to prevent leakage of fluid past the valve stem. The annular water passage 36 communicates by means of a port 42 with a water supply'connection e3. To insure a positive seating of the valve, a spring 46 is arran 'ed between the end surface of the valve and the closure l? of the valve chamber, and

a port" 48 to conduct the cleansing liquid from the annular chamber 36 to the chamber at the end ol the valve is provided, the pressure of the cleansing liquid cooperating with "the spring 46 to maintain the valve seated. Anv'suit'able form of control member may be employed to shift the valve through its va riouspositions and I have illustrated, by way of example, a manual lever 50 secured to the "end thereof.-

The operation of my device may be most readily followed by reference to Figs. 5 and '6. In Fig. 6 I have shown the parts in posiply liquid through valve 32 to the tube. A stil-l tnrther rotation will bring port 21 in communication with passage 23 while valve 32-1s-mamta1ned unseated. In stopping the drill 1t 1s obvious that a reverse operation and passage 23 is 'firstclosed, Ehevalve 32 is then permitted to seat as the cam moves from under the stein The port22 then communicates with port 2e? :and a final air 'b'l'ast is directed through the tube 19.

tiroly shut down.

It wil-l'be obvious that by thesep aration of the airand water control valves, Ihave reduced possibility of 'inter leakageof the two fluids to a minimum. It will" further be noted that during the supply or" liquid to the steel the passage 24; will be filled with water but this passage will beclosed at its end adjacen't the valve 18 by the unbroken surface of the. valve, and water will not be conducted, as in somecomm'ercial constructions, into the valve chamber by way of aport formed in the periphery of the valve.,, Accordingly, leale age will be reduced to a minimum and with a proper adjustment of parts, may be entirely prevented; I 4

l/Vhile I have ingthis application-specifical- 1y described one form which my invention may assume in practice, it will be understood that this form of the same is'shown for purposes of illustration and that the invention may be modified and embodied in other forms without departingtrom its spirit or the scope otthe appended claims.

W hat Iclaiin as new and desire to secure 7 by Letters Patent is: V a V 1. In a' -drilling mechanism, a motor, a hollow drill steel, a single final cleansing fluid supply conduit for conducting fluid tb said drill steel, an air supply leading to said conduit and to said motor, a water supply leading to said conduit, a valve for controlling said air supply to said conduit and motor, a valve for controlling said water supply to said conduit and controlling means for effecting ininvariable sequence upon movement of said air supply control valve in one direction the opening of said air supply to said conduit, the subsequent closing of said air supply, and thereatterthe opening'of said water supply to said conduit and said air supply to said motor. 1

2. In adrilling mechanism, a motor, a hollow drill: steel ,,a single final conduit for conducting fluid to said steel, an air supply for said conduit, a valve for controlling the supply of air therefrom to said motoriand to said conduit', a water supply for said conduit.

Communication "between port 21 supply control valve in one direction the admission of air to said conduit, the subsequent closing of said latter supply, and the supplying of water to said conduit and air to said motor.

3. In a drilling mechanism, a single final cleansing fluid supply conduit, an air supply for said conduit, a water supply for'said conduit, a passage communicating with said conduit and having branch passages communicating respectively with said air and water supplies, relatively movable valves for supplying fluid from said supplies to said branch passages in invariable sequence, and

means whereby movement of one of said valves will effect the'opening of the other.

4. In a drilling mechanism, a drilling motor, a hollow drill steel, a single final cleansing fluid supply conduit for conducting fluid to said drill steel, a liquid supply '1 therefor, a pressure fluid supply for said conduit,'a pressure fluid supply for said motor, a valve controlling said liquid supply, a valve controlling said pressure fluid supplies to both said conduit and said motor, and controlling means for effecting in invariable sequence upon movement of said pressure fluid control valve in one direction the opening of said liquid supply and said pressure fluid supply to said conduit and said motor comprising a cam formed on said pressure fluid controlling valve, a stem formed on said liquid controlling valve and cooperating with said cam, and a single manually graspable operating member for said valves carried by said pressure fluid control valve.

5. In a drilling mechanism, a liquid cleansing fluid supply, a gaseous pressure fluid sup ply, a valve for controlling said liquid supply. a valve for controlling said gaseous fluid supply, controlling means for eiiecting opening of said supplies in invariable sequence upon movement of said gaseousfluid supply valve in one direction comprising a cam formed on said gaseous fluid controlling valve, a stem formed on said liquid controlling valve and cooperating with said cam, and. means to maintain said stem in operative relationship with said cam including a conduit formed in said liquid controlling valve for causing the liquid to force the valve stem into contact with said cam.

6. A combined throttle and cleasing fluid control valve mechanism for a drilling motor having a tube for supplying fluid to a hollow drill steel comprising mechanism for controlline; the distribution of motive fluid to the motor and air and water to the tube including a casing having a valve chamber formed therein, a motive fluid port communicating with the chamber and adapted to conduct motivefluid to the motor, a gaseous pressure fluid supply port communicating with said chamber, a branched passage formed in the casing and communicating with the tube, one branch of said passage communicating with said chamber, a second valve chamber comniunicating with the other branch of said passage, a water supply port communicating with said last mentioned valve chamber, a reciprocable valve in said last mentioned valve chamber controlling the watersupply to said second branch, a valve member in said first ientioned valve chamber adapted to control the communi ation ofsaid motive fluid port, and of the first mentioned branch of said branched passage with said gaseous pressure fluid supply port, and means for effecting in invariable sequence upon movement of said motive fluid control valve in one direction the opening of said supply ports including means associated with said valve for controlling said first mentioned valve.

7. A combined throttle and cleansing fluid control valve mechanism for a drilling motor having a tube for supplying fluid to a hollow drill steel comprising mechanism for controlling the distribution of motive fluid to the motor and air and water to the tube including a casing having a valve chamber formed therein, a-motive fluid port communicating with the chamber and adapted to conduct motive fluid to the motor, a gaseous pressure fluid supply port communicating with said chamber, a branched passage formed in the casing and communicating with the tube, one branch of said passage communicating with said chamber, a second valve chamber communicating with the other branch of saidpassage, a water supply port communicating with said last mentioned valve chamber, a reciprocable valve in said last mentioned valve chamber controlling the water supply to said second branch, at rotatable valve member in said first mentioned alve chan'lber adapted to control the communi ration of said motive fluid port and of the first mentioned branch of said branched passage with said gaseous pressure fluid supply port-,and means for effecting in invariable sequence upon movement of said motive fluid control valve in one direction the opening of said supply ports including means rotatable upon rotation of said second mentioned valve member for controlling said first mentioned valve.

8. A combined throttle and cleansing fluid control valve mechanism for a drilling motor having a tube for supplying fluid to a hollow steel comprising amechanism for controlling the distribution of motive fluid to the motor and air and water to the tube including a casing having a valve chamber formed therein and a motive fluid port communicating with the chamber, a rotatable valve plug in i bra -nc'hed passage for-med in said casing andv "conr'm un-ic motive ene ening through the wall thereof adapte'c l to cooperate with the motive fluid port in the lor controlling the supply of motive second port tl'i-roiiigh the wall thereof, a

9' with the tube, said com m l J. J 1' 41 la-peed to control supply-m a ene branch or s, d'passage, rotatable therewith said valve plug h'av g a cam sur l ace, a second valve chamber coil,-

municating with the otherlna-nc h of said passage, a Water supply port con'u-nunicating with said last mentioned valve chamber, a valve 1n said last mentioned valve cha-n'iber (controlling the Water supply to said second branch, and means whereby said second mentioned valve may be controlled by the cam surface rotatable with said valve plug. 9. A combined throttleand cleans ng fluid control valve mechanism for a drilling motor having a tube for supplying fluid to hollow steel comprising mechanism for controlling the distribution or motive fluid to the motor and air-and Water to the tubeincluding a casinc having a valve chamber formed therein anu a motive iuid port conn'nunicating with the chamber, rota-table valve plug 1n said 7 chamber having "a hollow interior communicating witha source of anotrve fluid and an opening through the wall thereof adaptcd to cooperate with the anotrve fluid port 111 the casing for controlling the supply of motive fluid thereto, said valve p'lug also having a' second port through the Wall thereof, a

branched )assa e formed in said casin and l s s communicating with the tube, said second "portbeing adaptedto control thesupply of motive fluid to one branch of said passage, said valve plu havlng a reduced stem ex tending from an end thereof and a cam sur- 7 fluid control mechanism fora drilling-motor having a tube for supplying. cleansing fluid to a hollow drill steel operative to control the distribution or motive Hard "to the motor andair and water to the t'ubc'compri'singa casing havinga valve chamber *formed therein and a-motive fluid port communicating with the chamber, a rotatable valve plug in said chamber having'a hollow interior communicating with a source of gaseous fluid pressure and a communicatingopening through the Wall the-reed adapted to cooperate with the motive fluid port inthe' casing to control the supply of :motive fluid therethrough, passage means in said casing oonn municati havia ga second port through the Wall'thereoi, operative upon rotation :of said valve to controlthe supply of fluid pressure to said ,p'assagemeans, means for supplying water to said passage means including a water supply port, an end seating valve controlling the cemmunication 01 said water supply :port with said passage means, aneans for normally sea-tingsaid valve, :a cam surface associated with said first inc tinned valve, means asso ciatrd withsaid second mentioned valve and engageable with saidcl c l SlllfliilCG iUHl means for movingsazid first n'iention ed valve and thereby control mentioned valves. I V I 7 -11 In a drilling mechanism, a single final clear ising fluid supplyconduit, an airsupply leading to said conduit, a water supplyleading to'saidconr rit, relatively movable valves controlling said supplies, and means including a single menuallyoperable member tor etlcctinp; in invariable sequence upon] movement of said air supply controlvalve inone direction the opening ol said air supply, the sub cquent closing -oi: said air supply,;and the subscquent opening-of said water supply.

'12. A combined throttleand'cleansing fluid control valve mechanism for a drilling :motor having a siigle final conduit for supplying fluid-to a drilled lhole comprising an air supply leading to said dril'lmgmotoig an airvsupply leading to said'conduit, avwate r supply leading to said conduit, :relativel'y movable valves, for controlling said supplies, and means includin 9' a single manually operable member for 'eliiecting in invariable sequence upon movement of said air supply control valve in'one direction the opening of saidair supplyto said'conduit, thesubsequent closing ofsaid air supply, for subsequently opening oi 'the water supply to said conduit, and therea'l'terrthe opening of the air-supply to said motor. V

13. Ina drilling mechanism, a casing having a gaseousfluid supply passage and aliquid supply passagc,-a' single final cleansing fluid supply conduit withwhichsaid passages are communicable, separate controlling means tor'said gaseous fluid and liquid passages includin g aval-vezhaving' a hollow interior com imunic'ating with a source o'f gaseous fluid supply and having a port traversing the wall thereof and a relatively movable liquid controlling valve, and means whereby said controllingineans when-saidfair control valve is moved in onedirection first admits gaseous fluid from the interior thereof through said port to said conduit, subsequently closessaid gaseous supply to said c0nduit,-a'ntl thereafter vi h the tube, said valve'plug lll) opens the liquid controlling valve to efi'ect 7 liquid supply to said conduit, said operations occurring in a definite sequence.

14. In a drilling mechanism, a casing having a plurality of bores and gaseous fluid and liquid supply passages communicating respectively with said bores, a single final cleansing fluid supply conduit with which said gaseous fluid and liquid supplies are communicable, a valve in one o'lsaid bores having a hollow interior communicating with the source of gaseous fluid supply and having a port traversing the wall thereof, a valve in said second bore and having means for controlling the connection of said liquid sup ply with said supply conduit, and means whereby said first mentioned valve upon movement thereof in one direction first admits gaseous fluid to said supply conduit, subsequently closes the supply to said conduit, and thereafter effects the opening of said second mentioned valve to supply liquid to said supply conduit, said operations occurring in a definite sequence.

15. In a drilling mechanism, a casing having a plurality of bores and gaseous fluid and liquid supply passages communicating respectively with said bores, a single final cleansing fluid supply conduit With which said gaseous fluid and liquid supplies are communicable, a valve in one of said bores having a hollowinterior communicating with the source of gaseous fluid supply and having a port traversing the Wall thereof, a valve in said second bore and having means for controlling the connection of said liquid supply with said supply conduit, and means including a single manually graspable operating member whereby said first mentioned valve upon movement thereof in one direction first admits gaseous fluid to said supply conduit, subsequently closes the suppl to said conduit, and thereafter eflects tie opening of said second mentioned valve to supply liquid to said supply conduit, said operations occurring in a definite sequence.

In testimony whereof I aifix my signature.

ELMER G. GARTIN. 

